A regenerative energy-saving refining furnace for smelting magnesium with gas

Abstract

The present invention discloses a regenerative energy-saving refining furnace for smelting magnesium with gas, which comprises a furnace body: the furnace body consists of a refining pot, a furnace shell, an air box and a refining pot ring cover plate. A furnace bottom refractory brick is laid on the bottom side of the furnace shell, a pot-supporting refractory brick is laid on the upper side of the furnace bottom refractory brick, and a refining pot is arranged on the upper side of the pot-supporting refractory brick. A refining pot ring cover plate is installed on the upper side of the furnace shell and below the flange of the refining pot. Side wall refractory bricks are laid on the inner wall of the lower part of the refining pot ring cover plate. A furnace side wall heat insulation material is arranged outside the side wall refractory bricks. Air boxes are fixedly connected to both the front and rear ends of the furnace shell. Gas enters the furnace along the tangent of the inner wall of the furnace chamber, and the hot air after absorbing heat enters the furnace chamber along the tangent direction of the outer wall of the refining pot. The hot air can effectively protect the outer wall of the refining pot, avoid the direct blowing of the gas flame on the outer wall of the refining pot, cause damage to the refining pot, and can greatly extend the service life of the refining pot.

Description

Technical Field

[0001] The present invention relates to the field of non-ferrous metal smelting, and particularly to a gas regenerative energy-saving refining furnace for smelting magnesium. Background Art

[0002] As a light metal, magnesium is being used more and more widely. At present, the Pidgeon process is generally adopted at home and abroad to produce crude magnesium through a reduction furnace, and then the crude magnesium is remelted by adding a solvent in a refining furnace and cast into magnesium ingots for sale.

[0003] As a smelting device for magnesium production, the energy consumption of the refining furnace has a certain impact on the production cost of magnesium. Existing refining furnaces mainly include a gas directly fired and directly exhausted refining furnace and a gas refining furnace with regenerative burners symmetrically arranged at both ends and equipped with multiple refining pots.

[0004] The gas directly fired and directly exhausted refining furnace blows gas and air into the furnace chamber of the refining furnace through a blower for combustion, and the flue gas is discharged through a smoke exhaust pipe, and the temperature of the furnace chamber is controlled by adjusting the valve.

[0005] The gas refining furnace with regenerative burners symmetrically arranged at both ends and equipped with multiple refining pots has multiple regenerative burners symmetrically arranged at both ends of a cuboid refining furnace. A combustion chamber is provided between the burners and the furnace chamber and separated by a fire baffle wall, and multiple refining pots are installed in the furnace chamber. Summary of the Invention

[0006] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a gas regenerative energy-saving refining furnace for smelting magnesium, which is convenient for increasing the service life of the refining pot.

[0007] The present invention also provides a gas regenerative energy-saving refining furnace for smelting magnesium as described above, including a furnace body: the furnace body consists of a refining pot, a furnace shell, an air box and a refining pot ring cover plate. The bottom side of the furnace shell is lined with furnace bottom refractory bricks, the upper side of the furnace bottom refractory bricks is lined with pot support refractory bricks, the refining pot is arranged on the upper side of the pot support refractory bricks, the refining pot ring cover plate is installed on the upper side of the furnace shell and below the flange of the refining pot, side wall refractory bricks are lined on the inner wall of the lower part of the refining pot ring cover plate, furnace side wall heat preservation materials are arranged outside the side wall refractory bricks, air boxes are fixedly connected to both the front and rear ends of the furnace shell, ceramic regenerators are installed inside the air boxes located inside the furnace shell, burner refractory bricks are lined outside the ceramic regenerators, furnace throat refractory bricks are lined on the upper side of the side wall refractory bricks inside the furnace shell, and heat insulation materials are arranged on the inner wall of the furnace shell;

[0008] The output end of the front bellows is fixedly connected to the front air branch pipe, and the output end of the rear bellows is fixedly connected to the rear air branch pipe. Air branch manual regulating valves are arranged on the outer sides of the front air branch pipe and the rear air branch pipe. The outer ends of the front air branch pipe and the rear air branch pipe are fixedly connected to the four-way reversing valve. The outer side of the four-way reversing valve is fixedly connected to the smoke exhaust main pipe. The upper end of the smoke exhaust main pipe is fixedly connected to the smoke exhaust main pipe. The inner side of the four-way reversing valve is fixedly connected to the blower main pipe. A reversing valve cylinder is installed on the upper side of the four-way reversing valve.

[0009] The burner refractory bricks are of a hollow structure, and a front gas branch pipe is fixedly connected to the outer side of the front burner refractory bricks, and a rear gas branch pipe is fixedly connected to the outer side of the rear burner refractory bricks. Manual gas branch regulating valves are installed on the rear gas branch pipe and the pipes connecting the front gas branch pipe and the burner bricks. Gas condensate discharge ball valves are installed at the lower ends of the rear gas branch pipe and the front gas branch pipe near the furnace shell. A rear gas branch pipe pneumatic quick-closing valve is arranged on the outer side of the rear gas branch pipe, and a front gas branch pipe pneumatic quick-closing valve is arranged on the outer side of the front gas branch pipe.

[0010] The outer ends of the rear gas branch pipe and the front gas branch pipe are fixedly connected to the gas main pipeline. The outer side of the gas main pipeline is provided with a gas main pipeline manual gate valve, a gas main pipeline pneumatic fast closing valve and a gas main pipeline electric valve. The upper end of the gas main pipeline is fixedly connected to the gas main.

[0011] A smoke exhaust pipe valve is arranged on the outer side of the smoke exhaust main pipe.

[0012] The inner side of the four-way reversing valve is fixedly connected with a blower main pipeline, the outer end of the blower main pipeline is fixedly connected with a blower, and a blower pipeline regulating valve is installed on the blower main pipeline between the blower and the four-way reversing valve.

[0013] The above scheme has the following beneficial effects:

[0014] 1. The gas enters the furnace along the tangent line of the inner wall of the furnace through the burner bricks, and the hot air after absorbing heat enters the furnace along the tangent line of the outer wall of the refining pot, forming a rotating flame along the inner wall of the furnace. The hot air can effectively protect the outer wall of the refining pot, prevent the gas flame from directly blowing the outer wall of the refining pot, causing damage to the refining pot, and can greatly extend the service life of the refining pot.

[0015] 2. The heat preservation effect of the refining furnace is very good, so the ambient temperature of the crude magnesium smelting workshop is relatively low, the working environment of the furnace workers is comfortable, and the labor intensity is relatively low.

[0016] 3. A heat exchange chamber of the ceramic regenerator in the refining furnace is added, which greatly improves the utilization rate of thermal energy, reduces the exhaust gas temperature, and has an obvious energy-saving effect (more than 50% energy-saving compared with the direct-fired and direct-exhaust refining furnace, and more than 20% energy-saving compared with the regenerative refining furnace with symmetric layout), greatly reducing the melting cost of metallic magnesium.

[0017] 4. Using a single furnace with a single pot makes it very convenient to adjust the furnace temperature.

[0018] 5. Since there are upper, middle and lower layers of burners in the front and rear of the furnace, and the combustion circulates and reverses between the front and rear sides, it ensures that the temperature around the furnace of the refining pot is evenly distributed, can effectively improve the melting speed of crude magnesium, and improve production efficiency.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments;

[0021] Figure 1 It is the front view of a gas regenerative energy-saving refining furnace for melting metallic magnesium according to the present invention;

[0022] Figure 2 It is the partial top view sectional view of a gas regenerative energy-saving refining furnace for melting metallic magnesium according to the present invention;

[0023] Figure 3 It is the right view sectional view of a gas regenerative energy-saving refining furnace for melting metallic magnesium according to the present invention.

[0024] Legend: 1. Furnace body; 2. Four-way change-over valve; 3. Change-over valve cylinder; 4. Exhaust pipe valve; 5. Blower pipe regulating valve; 6. Manual gate valve of gas main pipe; 7. Pneumatic quick shut-off valve of gas main pipe; 8. Electric valve of gas main pipe; 9. Gas main pipe; 10. Gas main pipe; 11. Exhaust main pipe; 12. Exhaust main pipe; 13. Blower main pipe; 14. Blower; 15. Manual regulating valve of air branch pipe; 16. Manual regulating valve of gas branch pipe; 17. Ball valve for discharging gas condensate; 18. Rear side air branch pipe; 19. Refining pot; 20. Side wall heat-insulating material; 21. Heat-insulating material; 22. Side wall refractory brick; 23. Furnace shell; 24. Burner refractory brick; 25. Ceramic regenerator; 26. Air box; 27. Front side air branch pipe; 28. Rear side gas branch pipe; 29. Pneumatic quick shut-off valve of rear side gas branch pipe; 30. Front side gas branch pipe; 31. Pneumatic quick shut-off valve of front side gas branch pipe; 32. Cover plate of refining pot ring; 33. Firebrick for furnace throat constriction; 34. Firebrick for supporting pot; 35. Furnace bottom refractory brick. DETAILED DESCRIPTION OF THE INVENTION

[0025] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention. However, it should not be construed as a limitation on the protection scope of the present invention.

[0026] Referring to Figures 1-3 , an energy-saving refining furnace with regenerative combustion of gas for smelting magnesium metal according to an embodiment of the present invention includes a furnace body 1: The furnace body 1 is composed of a refining pot 19, a furnace shell 23, an air box 26, and a refining pot ring cover plate 32. A furnace bottom refractory brick 35 is laid on the bottom side of the furnace shell 23. There is a pot-supporting refractory brick 34 above the furnace bottom refractory brick 35, and the refining pot 19 is installed above the pot-supporting refractory brick 34. The refining pot ring cover plate 32 is installed above the furnace shell 23 and below the flange of the refining pot 19. Sidewall thermal insulation materials 20 are provided below the refining pot ring cover plate 32. Sidewall refractory bricks 22 are laid on the inner side of the furnace chamber. Sidewall thermal insulation materials 20 are provided outside the sidewall refractory bricks 22. The right sides of the front and rear ends of the furnace shell 23 are fixedly connected to the air box 26. The air box 26 is internally provided with ceramic regenerators 25. Burner refractory bricks 24 are laid outside the ceramic regenerators 25. A furnace chamber constriction refractory brick 33 is provided above the sidewall refractory bricks 22 on the inner sidewall of the furnace shell 23. Heat insulation materials 21 are provided on the inner wall of the furnace shell 23.

[0027] The output end of the front air box 26 is fixedly connected to a front air branch pipe 27, and the output end of the rear air box 26 is fixedly connected to a rear air branch pipe 18. Manual regulating valves 15 for air branch pipes are provided outside the front air branch pipe 27 and the rear air branch pipe 18. The outer ends of the front air branch pipe 27 and the rear air branch pipe 18 are respectively fixedly connected to the front and rear sides of a four-way reversing valve 2. A main exhaust pipe 12 is fixedly connected to the outside of the four-way reversing valve 2. The upper end of the main exhaust pipe 12 is fixedly connected to an exhaust main pipe 11. The four-way reversing valve 2 facilitates the reversing control of the furnace chamber flue gas and combustion-supporting air. A reversing valve cylinder 3 is installed above the four-way reversing valve 2 to facilitate providing a power source for the four-way reversing valve 2. An exhaust pipe valve 4 is installed on the main exhaust pipe 12. The inner side of the four-way reversing valve 2 is connected to a main blower pipe 13. The outer end of the main blower pipe 13 is fixedly connected to a blower 14. A blower pipe regulating valve 5 is installed between the blower 14 and the four-way reversing valve 2 to facilitate adjusting the air volume of the blower 14.

[0028] The burner refractory brick 24 is provided with a hollow structure. The outer side of the front burner refractory brick 24 is fixedly connected with a front gas branch pipe 30, and the outer side of the rear burner refractory brick 24 is fixedly connected with a rear gas branch pipe 28. A manual regulating valve 16 for gas branch pipes is installed on the connecting pipes of the rear gas branch pipe 28 and the front gas branch pipe 30 to the burner inlet of the furnace shell 23, which is convenient for adjusting the gas flow of the front, rear, upper, middle and lower burners. A drain ball valve 17 for gas condensate is installed near the lower end of the furnace shell 23 on the rear gas branch pipe 28 and the front gas branch pipe 30, and the drain ball valve 17 for gas condensate is convenient for discharging the gas condensate. A pneumatic quick shut-off valve 29 for the rear gas branch pipe is installed on the outer side of the rear gas branch pipe 28, and a pneumatic quick shut-off valve 31 for the front gas branch pipe is installed on the outer side of the front gas branch pipe 30. The outer ends of the rear gas branch pipe 28 and the front gas branch pipe 30 are both fixedly connected with a main gas pipe 9. A manual gate valve 6 for the main gas pipe is installed on the main gas pipe 9, which is convenient for manually controlling the gas flow. A pneumatic quick shut-off valve 7 for the main gas pipe and an electric valve 8 for the main gas pipe are convenient for pneumatically quickly cutting off the gas flow and electrically adjusting the gas flow size of the main gas pipe. The upper end of the main gas pipe 9 is fixedly connected with a main gas pipe 10, and the main gas pipe 10 is convenient for introducing gas into the refining pot 19.

[0029] Working principle: Gas enters along the tangents of the outer sides of the furnace through the front gas branch pipe 30 of the refining pot 19 and the upper, middle and lower burners of the furnace chamber, and mixes with the hot air entering the furnace chamber along the tangents of the outer wall of the refining pot 19 from the cavity of the front ceramic regenerator 25 and then burns to form a swirling flame. The flame is evenly distributed in the right furnace chamber of the refining pot 19. At this time, the pneumatic quick shut-off valve 31 for the front gas branch pipe is in the open state, and the pneumatic quick shut-off valve 29 for the rear gas branch pipe is in the closed state; the front air branch pipe 27 is in communication with the main blower pipe 13 through the four-way changeover valve 2, and the rear air branch pipe 18 is in communication with the main exhaust pipe 12 through the four-way changeover valve 2. After the flue gas absorbs a large amount of heat through the rear ceramic regenerator 25, it is discharged from the rear air branch pipe 18 to the main exhaust pipe 11 and enters the inlet of the induced draft fan of the desulfurization system.

[0030] After operating in this working state for about 30 seconds, the pneumatic quick shut-off valve 31 for the front gas branch pipe is closed, the pneumatic quick shut-off valve 29 for the rear gas branch pipe is opened, the front air branch pipe 27 is in communication with the main exhaust pipe 12 through the four-way changeover valve 2, and the rear air branch pipe 18 is in communication with the main blower pipe 13 through the four-way changeover valve 2. Gas enters along the tangents of the outer sides of the furnace through the rear gas pipe of the refining pot 19 and the upper, middle and lower burners of the furnace chamber, and mixes with the hot air entering the furnace chamber along the tangents of the outer wall of the refining pot 19 from the cavity of the rear ceramic regenerator 25 and then burns to form a swirling flame. The flame is evenly distributed in the left furnace chamber of the refining pot 19. After the flue gas absorbs a large amount of heat through the front ceramic regenerator 25, it is discharged from the front air branch pipe 27 to the main exhaust pipe 11 and enters the inlet of the induced draft fan of the desulfurization system.

[0031] After running for 30 seconds, switch to the previous working state, and run in this cycle to ensure uniform distribution of the furnace temperature (by adjusting the manual valves of the air pipeline and the gas pipeline, keep the furnace temperature at 850-900 °C all the time). After heat exchange through the ceramic regenerator 25, the exhaust gas temperature is reduced to 200-220 °C (ensure the exhaust gas temperature by adjusting the commutation time).

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A regenerative energy-saving refining furnace for smelting magnesium with gas, characterized in that, Including a furnace body (1): The furnace body (1) consists of a refining pot (19), a furnace shell (23), an air box (26), and a refining pot ring cover plate (32). A furnace bottom refractory brick (35) is laid on the bottom side of the furnace shell (23). A pot-supporting refractory brick (34) is laid on the upper side of the furnace bottom refractory brick (35). The refining pot (19) is arranged on the upper side of the pot-supporting refractory brick (34). The refining pot ring cover plate (32) is installed on the upper side of the furnace shell (23) and below the flange of the refining pot (19). Side wall refractory bricks (22) are laid on the inner wall of the lower part of the refining pot ring cover plate (32). A furnace side wall heat-insulating material (20) is arranged outside the side wall refractory bricks (22). Air boxes (26) are fixedly connected to both the front and rear ends of the furnace shell (23). A ceramic regenerator (25) is installed inside the air box (26) located inside the furnace shell (23). A burner refractory brick (24) is laid outside the ceramic regenerator (25). A furnace throat refractory brick (33) is laid inside the furnace shell (23) and above the side wall refractory bricks (22). A heat-insulating material (21) is arranged on the inner wall of the furnace shell (23); The output end of the front air box (26) is fixedly connected to a front air branch pipe (27). The output end of the rear air box (26) is fixedly connected to a rear air branch pipe (18). Manual air branch pipe regulating valves (15) are arranged outside the front air branch pipe (27) and the rear air branch pipe (18). The outer ends of the front air branch pipe (27) and the rear air branch pipe (18) are both fixedly connected to a four-way reversing valve (2). A main smoke exhaust pipe (12) is fixedly connected to the outside of the four-way reversing valve (2). The upper end of the main smoke exhaust pipe (12) is fixedly connected to a smoke exhaust main pipe (11). A main blower pipe (13) is fixedly connected to the inside of the four-way reversing valve (2). A reversing valve cylinder (3) is installed above the four-way reversing valve (2); The gas enters the furnace along the tangent of the inner wall of the furnace through the burner brick. The heated air after absorbing heat enters the furnace along the tangent direction of the outer wall of the refining pot, forming a swirling flame along the inner wall of the furnace.

2. The energy-saving refining furnace with regenerative combustion for smelting magnesium metal according to claim 1, characterized in that The burner refractory brick (24) is arranged in a hollow structure. A front gas branch pipe (30) is fixedly connected to the outside of the front burner refractory brick (24). A rear gas branch pipe (28) is fixedly connected to the outside of the rear burner refractory brick (24). Manual gas branch pipe regulating valves (16) are installed on the pipes where the rear gas branch pipe (28) and the front gas branch pipe (30) are connected to the burner brick. Gas condensate drain ball valves (17) are installed near the lower ends of the rear gas branch pipe (28) and the front gas branch pipe (30) close to the furnace shell (23). A pneumatic quick shut-off valve (29) for the rear gas branch pipe is arranged outside the rear gas branch pipe (28). A pneumatic quick shut-off valve (31) for the front gas branch pipe is arranged outside the front gas branch pipe (30).

3. The energy-saving refining furnace with regenerative combustion for smelting magnesium metal according to claim 2, characterized in that, The outer ends of the rear gas branch pipe (28) and the front gas branch pipe (30) are both fixedly connected to a gas main pipe (9); a gas main pipe manual gate valve (6), a gas main pipe pneumatic fast closing valve (7) and a gas main pipe electric valve (8) are arranged on the outer side of the gas main pipe (9); and the upper end of the gas main pipe (9) is fixedly connected to a gas main pipe (10).

4. A regenerative energy-saving refining furnace for smelting magnesium metal according to claim 1, characterized in that, A smoke exhaust pipe valve (4) is arranged on the outside of the smoke exhaust main pipe (11).

5. A regenerative energy-saving refining furnace for smelting magnesium with gas according to claim 1, characterized in that, The inner side of the four-way reversing valve (2) is fixedly connected to a blower main pipeline (13), the outer end of the blower main pipeline (13) is fixedly connected to a blower (14), and a blower pipeline regulating valve (5) is installed on the blower main pipeline (13) between the blower (14) and the four-way reversing valve (2).

Images